Fabre-Nys, C, Chanvallon, A, Debus, N, Francois, D, Bouvier, F, Dupont, J, Lardic, L, Didier, L, Ramé, C, Scaramuzzi, R J, "Plasma and ovarian oestradiol and the variability in the LH surge induced in ewes by the ram effect", REPRODUCTION,